/// <summary>
/// Create new Bitmap object
/// </summary>
/// <param name="width"></param>
/// <param name="height"></param>
/// <param name="pixelData"></param>
/// <param name="bitsPerPixel"></param>
public Bitmap(int width, int height, byte[] pixelData, BitsPerPixelEnum bitsPerPixel = BitsPerPixelEnum.RGB24)
{
this.Width = width;
this.Height = height;
this.PixelData = pixelData ?? throw new ArgumentNullException(nameof(pixelData));
this.BitsPerPixelEnum = bitsPerPixel;
var rawImageSize = BytesPerRow * height;
// Are we receiving proper byte[] size ?
if (pixelData.Length != width * height * BytesPerPixel)
{
throw new ArgumentOutOfRangeException($"{nameof( pixelData )} has invalid size.");
}
if (bitsPerPixel == BitsPerPixelEnum.RGB24)
{
this.InfoHeaderBytes = new BitmapInfoHeader(width, height, bitsPerPixel, rawImageSize).HeaderInfoBytes;
}
if (bitsPerPixel == BitsPerPixelEnum.RGBA32)
{
this.InfoHeaderBytes = new BitmapInfoHeaderRGBA(width, height, bitsPerPixel, rawImageSize).HeaderInfoBytes;
}
this.FileHeader = new BitmapFileHeader(width, height, bitsPerPixel, rawImageSize);
}
/// <summary>
/// Create header and calculate file size depending on input data
/// </summary>
/// <param name="width"></param>
/// <param name="height"></param>
/// <param name="bitsPerPixel"></param>
/// <param name="rawImageSize">Depends on row padding and number of rows</param>
public BitmapFileHeader(int width = 1, int height = 1, BitsPerPixelEnum bitsPerPixel = BitsPerPixelEnum.RGB24, int rawImageSize = 0)
{
//if (System.BitConverter.IsLittleEndian)
var infoHeaderSize = bitsPerPixel == BitsPerPixelEnum.RGB24 ? BitmapInfoHeader.SizeInBytes : BitmapInfoHeaderRGBA.SizeInBytes;
FileSize = (uint)(BitmapFileHeader.BitmapFileHeaderSizeInBytes + infoHeaderSize + rawImageSize);
PixelDataOffset = (uint)(BitmapFileHeader.BitmapFileHeaderSizeInBytes + infoHeaderSize);
//infoHeader = new BitmapInfoHeader( Width, Height, BitsPerPixel: BitsPerPixel, rawImageSize: rawImageSize );
}
#pragma warning restore CS0414
/// <summary>
/// DIB header (bitmap information header)
/// This is standard Windows BITMAPINFOHEADER as described here https://en.wikipedia.org/wiki/BMP_file_format#Bitmap_file_header
/// </summary>
public BitmapInfoHeaderRGBA(int width, int height, BitsPerPixelEnum bitsPerPixel = BitsPerPixelEnum.RGB24, int rawImageSize = 0, int horizontalPixelPerMeter = 3780, int verticalPixelPerMeter = 3780, CompressionMethod compressionMethod = CompressionMethod.BI_BITFIELDS) :
base(width, height, bitsPerPixel, rawImageSize, horizontalPixelPerMeter, verticalPixelPerMeter, compressionMethod)
{
//this.Width = width;
//this.Height = height;
//this.BitsPerPixel = bitsPerPixel;
//this.CompressionMethod = (uint) CompressionMethod.BI_RGB;
//this.ImageSize = rawImageSize;
//this.HorizontalPixelPerMeter = horizontalPixelPerMeter; // 96 DPI
//this.VerticalPixelPerMeter = verticalPixelPerMeter; // 96 DPI
}
#pragma warning restore CS0414
/// <summary>
/// DIB header (bitmap information header)
/// This is standard Windows BITMAPINFOHEADER as described here https://en.wikipedia.org/wiki/BMP_file_format#Bitmap_file_header
/// </summary>
/// <param name="width"></param>
/// <param name="height"></param>
/// <param name="bitsPerPixel"></param>
/// <param name="rawImageSize"></param>
public BitmapInfoHeader(int width, int height, BitsPerPixelEnum bitsPerPixel = BitsPerPixelEnum.RGB24, int rawImageSize = 0, int horizontalPixelPerMeter = 3780, int verticalPixelPerMeter = 3780, CompressionMethod compressionMethod = CompressionMethod.BI_RGB)
{
this.Width = width;
this.Height = height;
this.BitsPerPixel = bitsPerPixel;
this.CompressionMethod = compressionMethod; // CompressionMethod.BI_RGB;
this.ImageSize = rawImageSize;
this.HorizontalPixelPerMeter = horizontalPixelPerMeter; // 96 DPI
this.VerticalPixelPerMeter = verticalPixelPerMeter; // 96 DPI
this.nuberOfColorsInPallete = 0; // ignored
this.numberOfImportantColorsUsed = 0; // ignored
}
/// <summary> /// Check if padding is required (extra bytes for a row). /// </summary> /// <param name="width">Width of image</param> /// <param name="bitsPerPixel">Bits per pixels to calculate actual byte requirement</param> /// <param name="bytesPerRow">BMP required bytes per row</param> /// <returns>True/false if we need to allocate extra bytes (for BMP saving) for padding</returns> public static bool IsPaddingRequired(int width, BitsPerPixelEnum bitsPerPixel, int bytesPerRow) => bytesPerRow != width * (int)bitsPerPixel / 8;
/// <summary> /// BMP file must be aligned at 4 bytes at the end of row /// </summary> /// <param name="width">Image Width</param> /// <param name="bitsPerPixel">Bits per pixel</param> /// <returns>How many bytes BMP requires per row</returns> public static int RequiredBytesPerRow(int width, BitsPerPixelEnum bitsPerPixel) => (int)Math.Ceiling((decimal)(width * (int)bitsPerPixel) / 32) * 4;
